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hey,do u need points supporting this statement?
i mean,do u need the demerits of friction?
can u list 10 disadvantage of friction its my assignment


Well Friction is good and also evil
Due to friction lot of heat energy is wasted in machines 
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Friction has both harmful and beneficial effects and hence it is called a necessary evil
it is also an evil because it
causes wear and tear of the parts
A lot of energy is wasted to overcome it
causes wear and tear of the soles of shoes.
Slows down or stops the movement of objects
Produces unnecessary heat
       "  undesirable noise.
Engines of automobiles consume more fuel due to friction.
Friction between trees causes forest fires
Efficiency of machine is decreased

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don eel ad soy
i got this from many
dont feel bad sorry
aah,never mind
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